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10000EC405122101

of wavelength 0.9൩. When the incident optical power is 0.5 uW, the output
current from the device is after multiplication is 12. Determine the
multiplication factor of the RAPD.
Discuss the design issues to be addressed in fiber optic communication system
How to calculate link power budget of an optical link. Consider basic
components only.
GaAs has a bandgap energy of 1.43.eV at 300k. Determine the wavelength
above which an intrinsic photo detector fabricated using GaAs will cease to
operate.
Write notes on the semiconductor materials used for making photo detectors.
Draw the schematic diagram of coherent optical communication system which
uses homodyne detection. What are the advantages and disadvantages.
What is quantum limit of detection?
What is Gordon Haus effect in soliton system.
PART C

Answer any two full questions, each carries 20 marks.
Draw the block schematic, energy band diagram and gain spectrum of EDFA.
Give its technical features
Give different applications of optical amplifiers.
Compare 980nm pump and 1480 pump used in EDFA.
What is FBG? With the help of necessary diagram, describe the method of
optical filtering using FBG
Differentiate between core interaction type and surface interaction type optical
couplers
What is free space optics? Write the advantages and challenges of free space
communication,
Describe the principle of raman amplifier. Compare its features with EDFA.
What is OTDR? Plot sample OTDR trace and name three applications of OTDR

What are the advantages of LiFi technology?

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